Module: RDF::Vocabulary::Term
- Includes:
- Resource
- Defined in:
- lib/rdf/vocabulary.rb
Overview
A Vocabulary Term is a Resource that can also act as an Enumerable to generate the RDF definition of vocabulary terms as defined within the vocabulary definition.
Terms include #attributes where values a embedded resources, lists or other terms. This allows, for example, navigation of a concept heirarchy.
Term attributes can also be accessed using #properties where the attribute values are transformed into different types of RDF::Value. Properties can be indexed by key, where a key is defined (See ATTR_URIs), absolute URI, or PName, where the prefix is associated with a loaded vocabulary.
Constant Summary collapse
- ATTR_URIs =
Look up URIs for attribute symbols
{ allValuesFrom: RDF::URI("http://www.w3.org/2002/07/owl#allValuesFrom"), altLabel: RDF::URI("http://www.w3.org/2004/02/skos/core#altLabel"), broader: RDF::URI("http://www.w3.org/2004/02/skos/core#broader"), cardinality: RDF::URI("http://www.w3.org/2002/07/owl#cardinality"), comment: RDF::URI("http://www.w3.org/2000/01/rdf-schema#comment"), definition: RDF::URI("http://www.w3.org/2004/02/skos/core#definition"), domain: RDF::URI("http://www.w3.org/2000/01/rdf-schema#domain"), domainIncludes: RDF::URI("http://schema.org/domainIncludes"), editorialNote: RDF::URI("http://www.w3.org/2004/02/skos/core#editorialNote"), equivalentClass: RDF::URI("http://www.w3.org/2002/07/owl#equivalentClass"), equivalentProperty: RDF::URI("http://www.w3.org/2002/07/owl#equivalentProperty"), exactMatch: RDF::URI("http://www.w3.org/2004/02/skos/core#exactMatch"), hasTopConcept: RDF::URI("http://www.w3.org/2004/02/skos/core#hasTopConcept"), inScheme: RDF::URI("http://www.w3.org/2004/02/skos/core#inScheme"), intersectionOf: RDF::URI("http://www.w3.org/2002/07/owl#intersectionOf"), inverseOf: RDF::URI("http://www.w3.org/2002/07/owl#inverseOf"), isDefinedBy: RDF::URI("http://www.w3.org/2000/01/rdf-schema#isDefinedBy"), label: RDF::URI("http://www.w3.org/2000/01/rdf-schema#label"), maxCardinality: RDF::URI("http://www.w3.org/2002/07/owl#maxCardinality"), member: RDF::URI("http://www.w3.org/2004/02/skos/core#member"), minCardinality: RDF::URI("http://www.w3.org/2002/07/owl#minCardinality"), narrower: RDF::URI("http://www.w3.org/2004/02/skos/core#narrower"), notation: RDF::URI("http://www.w3.org/2004/02/skos/core#notation"), note: RDF::URI("http://www.w3.org/2004/02/skos/core#note"), onProperty: RDF::URI("http://www.w3.org/2002/07/owl#onProperty"), prefLabel: RDF::URI("http://www.w3.org/2004/02/skos/core#prefLabel"), range: RDF::URI("http://www.w3.org/2000/01/rdf-schema#range"), rangeIncludes: RDF::URI("http://schema.org/rangeIncludes"), related: RDF::URI("http://www.w3.org/2004/02/skos/core#related"), someValuesFrom: RDF::URI("http://www.w3.org/2002/07/owl#someValuesFrom"), subClassOf: RDF::URI("http://www.w3.org/2000/01/rdf-schema#subClassOf"), subPropertyOf: RDF::URI("http://www.w3.org/2000/01/rdf-schema#subPropertyOf"), type: RDF::URI("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"), unionOf: RDF::URI("http://www.w3.org/2002/07/owl#unionOf"), }.freeze
- URI_ATTRs =
Look up attribute symbols from URIs
ATTR_URIs.invert.freeze
Instance Attribute Summary collapse
-
#allValuesFrom ⇒ Array<Term>
readonly
owl:allValuesFrom
accessor. -
#altLabel ⇒ Literal+
readonly
skos:altLabel
accessor. -
#attributes ⇒ Hash{Symbol => String, Term, Hash{Symbol => String}, Array<String, Term, Hash{Symbol => String}>}
readonly
Attributes of this vocabulary term, used for finding
label
andcomment
and to serialize the term back to RDF. -
#broader ⇒ Array<Term>
readonly
skos:broader
accessor. -
#cardinality ⇒ Array<Literal>
readonly
owl:cardinality
accessor. -
#comment ⇒ Literal+
readonly
rdfs:comment
accessor. -
#definition ⇒ Literal+
readonly
skos:definition
accessor. -
#domain ⇒ Array<Term>
readonly
rdfs:domain
accessor. -
#domainIncludes ⇒ Array<Term>
readonly
schema:domainIncludes
accessor. -
#editorialNote ⇒ Literal+
readonly
skos:editorialNote
accessor. -
#equivalentClass ⇒ Array<Term>
readonly
owl:equivalentClass
accessor. -
#equivalentProperty ⇒ Array<Term>
readonly
owl:equivalentProperty
accessor. -
#exactMatch ⇒ Array<Term>
readonly
skos:exactMatch
accessor. -
#hasTopConcept ⇒ Array<Term>
readonly
skos:hasTopConcept
accessor. -
#inScheme ⇒ Array<Term>
readonly
skos:inScheme
accessor. -
#intersectionOf ⇒ Array<Term>
readonly
owl:intersectionOf
accessor. -
#inverseOf ⇒ Array<Term>
readonly
owl:inverseOf
accessor. -
#isDefinedBy ⇒ Array<Term>
readonly
rdfs:isDefinedBy
accessor. -
#label ⇒ Literal
readonly
rdfs:label
accessor. -
#maxCardinality ⇒ Array<Literal>
readonly
owl:maxCardinality
accessor. -
#member ⇒ Array<Term>
readonly
skos:member
accessor. -
#minCardinality ⇒ Array<Literal>
readonly
owl:minCardinality
accessor. -
#narrower ⇒ Array<Term>
readonly
skos:narrower
accessor. -
#notation ⇒ Literal+
readonly
skos:notation
accessor. -
#note ⇒ Literal+
readonly
skos:note
accessor. -
#onProperty ⇒ Array<Term>
readonly
owl:onProperty
accessor. -
#prefLabel ⇒ Literal
readonly
skos:prefLabel
accessor. -
#range ⇒ Array<Term>
readonly
rdfs:range
accessor. -
#rangeIncludes ⇒ Array<Term>
readonly
schema:rangeIncludes
accessor. -
#related ⇒ Array<Term>
readonly
skos:related
accessor. -
#someValuesFrom ⇒ Array<Term>
readonly
owl:someValuesFrom
accessor. -
#subClassOf ⇒ Array<Term>
readonly
rdfs:subClassOf
accessor. -
#subPropertyOf ⇒ Array<Term>
readonly
rdfs:subPropertyOf
accessor. -
#type ⇒ Array<Term>
readonly
rdf:type
accessor. -
#unionOf ⇒ List<Term>, Array<Term>
readonly
owl:unionOf
accessor. -
#vocab ⇒ RDF::Vocabulary
readonly
Vocabulary of this term.
Class Method Summary collapse
-
.intern(str, *args, **options) ⇒ RDF::URI
Returns an interned
RDF::URI
instance based on the givenuri
string. -
.new(*args, vocab: nil, attributes: {}, **options) ⇒ Object
Instance Method Summary collapse
-
#attribute_value(prop) ⇒ RDF::Value+
Values of an attributes as RDF::Value.
-
#class? ⇒ Boolean
Is this a class term?.
-
#datatype? ⇒ Boolean
Is this a class term?.
-
#domain_includes ⇒ RDF::URI
Accessor for
schema:domainIncludes
. -
#dup ⇒ RDF::URI
Returns a duplicate copy of
self
. -
#each_statement {|| ... } ⇒ Object
Enumerate each statement constructed from the defined vocabulary terms.
-
#enum_for(method = :each_statement, *args) ⇒ RDF::Enumerable::Enumerator
(also: #to_enum)
Return an enumerator over Statement defined for this vocabulary.
-
#inspect ⇒ String
Returns a
String
representation of the URI object’s state. -
#method_missing(method, *args, &block) ⇒ Object
protected
Implement accessor to symbol attributes.
-
#other? ⇒ Boolean
Is this neither a class, property or datatype term?.
-
#properties ⇒ Hash{Symbol => Array<RDF::Value>}
Enumerate attributes with values transformed into RDF::Value instances Uses an empty hash with a default_proc which looks up values in attributes.
-
#property? ⇒ Boolean
Is this a class term?.
-
#range_includes ⇒ RDF::URI
Accessor for
schema:rangeIncludes
. -
#respond_to?(method, include_all = false) ⇒ Boolean
Implement accessor to symbol attributes.
-
#restriction? ⇒ Boolean
Is this a Restriction term?.
-
#to_ruby(indent: "") ⇒ String
Serialize back to a Ruby source initializer.
-
#valid? ⇒ Boolean
Determine if the URI is a valid according to RFC3987.
Methods included from Resource
Methods included from Term
#<=>, #==, #compatible?, #eql?, #escape, #term?, #terms, #to_base, #to_term
Methods included from RDF::Value
#anonymous?, #canonicalize, #canonicalize!, #constant?, #graph?, #inspect!, #invalid?, #iri?, #list?, #literal?, #node?, #resource?, #start_with?, #statement?, #term?, #to_nquads, #to_ntriples, #to_rdf, #to_term, #type_error, #uri?, #validate!, #variable?
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(method, *args, &block) ⇒ Object (protected)
Implement accessor to symbol attributes
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# File 'lib/rdf/vocabulary.rb', line 1274 def method_missing(method, *args, &block) case method when :comment, :notation, :note, :editorialNote, :definition attribute_value(method) when :label, :altLabel, :prefLabel # Defaults to URI fragment or path tail begin attribute_value(method) rescue KeyError to_s.split(/[\/\#]/).last end when :type, :subClassOf, :subPropertyOf, :domain, :range, :isDefinedBy, :allValuesFrom, :cardinality, :equivalentClass, :equivalentProperty, :imports, :intersectionOf, :inverseOf, :maxCardinality, :minCardinality, :onProperty, :someValuesFrom, :unionOf, :domainIncludes, :rangeIncludes, :broader, :exactMatch, :hasTopConcept, :inScheme, :member, :narrower, :related # Return value as an Array, unless it is a list case value = attribute_value(method) when Array, RDF::List then value else [value].compact end else super end end |
Instance Attribute Details
#allValuesFrom ⇒ Array<Term> (readonly)
owl:allValuesFrom
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#attributes ⇒ Hash{Symbol => String, Term, Hash{Symbol => String}, Array<String, Term, Hash{Symbol => String}>} (readonly)
lookup by PName is DEPRECATED and will be removed in a future version.
Attributes of this vocabulary term, used for finding label
and comment
and to serialize the term back to RDF.
Attributes are indexed by symbol. Symbols directly interpreted by a term are the accessors defined for the RDF::Vocabulary::Term class, also in ATTR_URIs. Other keys are interpreted as absolute URIs or PNames for properties defined on this term.
Symbols which are accessors may also be looked up by their associated URI.
Values may be Strings, Hash (Map), or Terms, or an Array including a combination of these. A Hash (Map) is used to create a datatype/language map to one or more string values which represent either datatyped literals, or language-tagged literals as interpreted by #attribute_value.
In general, this accessor is used internally. The #properties method interprets these values as RDF::Value.
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# File 'lib/rdf/vocabulary.rb', line 933 def attributes @attributes end |
#cardinality ⇒ Array<Literal> (readonly)
owl:cardinality
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#domainIncludes ⇒ Array<Term> (readonly)
schema:domainIncludes
accessor
|
# File 'lib/rdf/vocabulary.rb', line 860
|
#editorialNote ⇒ Literal+ (readonly)
skos:editorialNote
accessor
|
# File 'lib/rdf/vocabulary.rb', line 867
|
#equivalentClass ⇒ Array<Term> (readonly)
owl:equivalentClass
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#equivalentProperty ⇒ Array<Term> (readonly)
owl:equivalentProperty
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#exactMatch ⇒ Array<Term> (readonly)
skos:exactMatch
accessor
|
# File 'lib/rdf/vocabulary.rb', line 867
|
#hasTopConcept ⇒ Array<Term> (readonly)
skos:hasTopConcept
accessor
|
# File 'lib/rdf/vocabulary.rb', line 867
|
#intersectionOf ⇒ Array<Term> (readonly)
owl:intersectionOf
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#isDefinedBy ⇒ Array<Term> (readonly)
rdfs:isDefinedBy
accessor
|
# File 'lib/rdf/vocabulary.rb', line 801
|
#maxCardinality ⇒ Array<Literal> (readonly)
owl:maxCardinality
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#minCardinality ⇒ Array<Literal> (readonly)
owl:minCardinality
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#onProperty ⇒ Array<Term> (readonly)
owl:onProperty
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#rangeIncludes ⇒ Array<Term> (readonly)
schema:rangeIncludes
accessor
|
# File 'lib/rdf/vocabulary.rb', line 860
|
#someValuesFrom ⇒ Array<Term> (readonly)
owl:someValuesFrom
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#subClassOf ⇒ Array<Term> (readonly)
rdfs:subClassOf
accessor
|
# File 'lib/rdf/vocabulary.rb', line 801
|
#subPropertyOf ⇒ Array<Term> (readonly)
rdfs:subPropertyOf
accessor
|
# File 'lib/rdf/vocabulary.rb', line 801
|
#unionOf ⇒ List<Term>, Array<Term> (readonly)
owl:unionOf
accessor
|
# File 'lib/rdf/vocabulary.rb', line 826
|
#vocab ⇒ RDF::Vocabulary (readonly)
Vocabulary of this term.
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# File 'lib/rdf/vocabulary.rb', line 911 def vocab @vocab end |
Class Method Details
.intern(str, *args, **options) ⇒ RDF::URI
Returns an interned RDF::URI
instance based on the given uri
string.
The maximum number of cached interned URI references is given by the
CACHE_SIZE
constant. This value is unlimited by default, in which
case an interned URI object will be purged only when the last strong
reference to it is garbage collected (i.e., when its finalizer runs).
Excepting special memory-limited circumstances, it should always be
safe and preferred to construct new URI references using
RDF::URI.intern
instead of RDF::URI.new
, since if an interned
object can’t be returned for some reason, this method will fall back
to returning a freshly-allocated one.
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# File 'lib/rdf/vocabulary.rb', line 1008 def self.intern(str, *args, **) (URI.cache[(str = str.to_s).to_sym] ||= self.new(str, *args, **)).freeze end |
.new(uri, attributes: , vocab: , **options) ⇒ Object .new(attributes: , vocab: , **options) ⇒ Object
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# File 'lib/rdf/vocabulary.rb', line 950 def self.new(*args, vocab: nil, attributes: {}, **) klass = if args.first.nil? RDF::Node elsif args.first.is_a?(Hash) args.unshift(nil) RDF::Node elsif args.first.to_s.start_with?("_:") args = args[1..-1].unshift($1) RDF::Node else RDF::URI end # Create default proc on attributes to allow lookup by different key types. attributes = attributes.dup if attributes.frozen? attributes.default_proc = -> (hash, key) do sym = case key when RDF::URI URI_ATTRs.fetch(key, key.to_s.to_sym) when String URI_ATTRs.fetch(RDF::URI(key), key.to_s.to_sym) when Symbol case key.to_s when /^https?:/ # Lookup by associated attribute, or pname URI_ATTRs.fetch(RDF::URI(key.to_s), RDF::URI(key).pname.to_sym) when /:/ uri = RDF::Vocabulary.(key) # Lookup by associated attribute or URI URI_ATTRs.fetch(uri, uri.to_s.to_sym) end end hash.fetch(sym, nil) end term = klass.allocate.extend(Term) term.send(:initialize, *args) term.instance_variable_set(:@vocab, vocab) term.instance_variable_set(:@attributes, attributes) term end |
Instance Method Details
#attribute_value(prop) ⇒ RDF::Value+
Values of an attributes as RDF::Value.
Attribute values are returned as either an RDF::Value or Array<RDf::Value if there is more than one value.
Attribute values which are not already a RDF::Value (including strings and symbols) are converted by a heuristic loookup as follows:
- An URI if it can be turned into a valid IRI using RDF::Vocabulary.expand_pname. This includes IRIs already in non-relative form.
- A Hash{Symbol=>String,Array<String>} is interpreted as a datatype/language map. If the key contains a ':', it is treated as a PName or IRI datatype applied to the values. Otherwise, it is treated as a language-tag applied to the values.
- Literal::Date if valid,
- Literal::DateTime if valid,
- Literal::Integer if valid,
- Literal::Decimal if valid,
- Literal::Double if valid,
- Literal::Boolean if valid
- Otherwise, Literal where type may be inferred by the class of the value.
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# File 'lib/rdf/vocabulary.rb', line 1111 def attribute_value(prop) values = attributes[prop] return nil if values.nil? values = [values].compact unless values.is_a?(Array) prop_values = values.map do |value| v = value.is_a?(Symbol) ? value.to_s : value value = (RDF::Vocabulary.(v) rescue nil) if v.is_a?(String) && v.include?(':') value = value.to_uri if value.respond_to?(:to_uri) value = if value.is_a?(RDF::Value) && value.valid? value elsif value.is_a?(Hash) # type/language map value.inject([]) do |memo, (k,v)| vv = [v] unless v.is_a?(Array) memo << if k.to_s.include?(':') dt = RDF::Vocabulary.(v) rescue nil vv.map {|val| RDF::Literal(val, datatype: dt)} else vv.map {|val| RDF::Literal(val, language: k)} end end.flatten.compact.select(&:valid?) else # Use as most appropriate literal [ RDF::Literal::Date, RDF::Literal::DateTime, RDF::Literal::Integer, RDF::Literal::Decimal, RDF::Literal::Double, RDF::Literal::Boolean, RDF::Literal ].inject(nil) do |m, klass| m || begin l = klass.new(v) l if l.valid? end end end end.flatten prop_values.length <= 1 ? prop_values.first : prop_values end |
#class? ⇒ Boolean
Is this a class term?
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# File 'lib/rdf/vocabulary.rb', line 1036 def class? Array(self.type).any? {|t| t.to_s.include?('Class')} end |
#datatype? ⇒ Boolean
Is this a class term?
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# File 'lib/rdf/vocabulary.rb', line 1050 def datatype? Array(self.type).any? {|t| t.to_s.include?('Datatype')} end |
#domain_includes ⇒ RDF::URI
Accessor for schema:domainIncludes
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# File 'lib/rdf/vocabulary.rb', line 1223 def domain_includes domainIncludes end |
#dup ⇒ RDF::URI
Returns a duplicate copy of self
.
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# File 'lib/rdf/vocabulary.rb', line 1016 def dup term = super.extend(Term) term.instance_variable_set(:@vocab, vocab) term.instance_variable_set(:@attributes, attributes) term end |
#each_statement {|| ... } ⇒ Object
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# File 'lib/rdf/vocabulary.rb', line 1161 def each_statement attributes.keys.each do |p| prop = ATTR_URIs.fetch(p) { RDF::Vocabulary::(p)} values = attribute_value(p) values = [values].compact unless values.is_a?(Array) values.each do |value| yield RDF::Statement(self, prop, value) if prop.is_a?(RDF::URI) # Enumerate over value statements, if enumerable if value.is_a?(RDF::Enumerable) || (value.is_a?(Term) && value.node?) value.each_statement {|s| yield s} end end end end |
#enum_for(method = :each_statement, *args) ⇒ RDF::Enumerable::Enumerator Also known as: to_enum
Return an enumerator over Statement defined for this vocabulary.
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# File 'lib/rdf/vocabulary.rb', line 1181 def enum_for(method = :each_statement, *args) # Ensure that enumerators are, themselves, queryable this = self Enumerable::Enumerator.new do |yielder| this.send(method, *args) {|*y| yielder << (y.length > 1 ? y : y.first)} end end |
#inspect ⇒ String
Returns a String
representation of the URI object’s state.
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# File 'lib/rdf/vocabulary.rb', line 1194 def inspect sprintf("#<%s:%#0x ID:%s>", Term.to_s, self.object_id, self.to_s) end |
#other? ⇒ Boolean
Is this neither a class, property or datatype term?
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# File 'lib/rdf/vocabulary.rb', line 1064 def other? Array(self.type).none? {|t| t.to_s.match?(/(Class|Property|Datatype|Restriction)/)} end |
#properties ⇒ Hash{Symbol => Array<RDF::Value>}
lookup by PName is DEPRECATED and will be removed in a future version.
Enumerate attributes with values transformed into RDF::Value instances Uses an empty hash with a default_proc which looks up values in attributes. The prevents specific attributes from being evaluated until acessed.
Properties are indexed by symbol. Symbols directly interpreted by a term are the accessors defined for the RDF::Vocabulary::Term class, also in ATTR_URIs. Other keys are interpreted as absolute URIs or PNames for properties defined on this term.
Symbols which are accessors may also be looked up by their associated URI.
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# File 'lib/rdf/vocabulary.rb', line 1088 def properties Hash.new {|hash, key| attribute_value(key)} end |
#property? ⇒ Boolean
Is this a class term?
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# File 'lib/rdf/vocabulary.rb', line 1043 def property? Array(self.type).any? {|t| t.to_s.include?('Property')} end |
#range_includes ⇒ RDF::URI
Accessor for schema:rangeIncludes
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# File 'lib/rdf/vocabulary.rb', line 1229 def range_includes rangeIncludes end |
#respond_to?(method, include_all = false) ⇒ Boolean
Implement accessor to symbol attributes
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# File 'lib/rdf/vocabulary.rb', line 1199 def respond_to?(method, include_all = false) case method when :comment, :notation, :note, :editorialNote, :definition, :label, :altLabel, :prefLabel, :type, :isDefinedBy true when :subClassOf, :subPropertyOf, :domainIncludes, :rangeIncludes, :equivalentClass, :intersectionOf, :unionOf self.class? when :domain, :range, :equivalentProperty, :inverseOf self.property? when :allValuesFrom, :cardinality, :maxCardinality, :minCardinality, :onProperty, :someValuesFrom self.restriction? when :broader, :exactMatch, :hasTopConcept, :inScheme, :member, :narrower, :related @attributes.key?(method) else super end end |
#restriction? ⇒ Boolean
Is this a Restriction term?
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# File 'lib/rdf/vocabulary.rb', line 1057 def restriction? Array(self.type).any? {|t| t.to_s.include?('Restriction')} end |
#to_ruby(indent: "") ⇒ String
Serialize back to a Ruby source initializer. This is used primarily by Writer.
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# File 'lib/rdf/vocabulary.rb', line 1238 def to_ruby(indent: "") "term(" + (self.uri? ? self.to_s.inspect + ",\n" : "\n") + "#{indent} " + attributes.keys.sort.map do |k| values = attribute_value(k) values = [values].compact unless values.is_a?(Array) values = values.map do |value| if value.is_a?(Literal) && %w(: comment definition notation note editorialNote).include?(k.to_s) "%(#{value.to_s.gsub('(', '\(').gsub(')', '\)')})" elsif value.node? && value.is_a?(RDF::Vocabulary::Term) "#{value.to_ruby(indent: indent + " ")}" elsif value.is_a?(RDF::Term) "#{value.to_s.inspect}" elsif value.is_a?(RDF::List) list_elements = value.map do |u| if u.uri? "#{u.to_s.inspect}" elsif u.node? && u.respond_to?(:to_ruby) u.to_ruby(indent: indent + " ") else "#{u.to_s.inspect}" end end "list(#{list_elements.join(', ')})" else "#{value.inspect}" end end "#{k.to_s.include?(':') ? k.to_s.inspect : k}: " + (values.length == 1 ? values.first : ('[' + values.join(',') + ']')) end.join(",\n#{indent} ") + "\n#{indent})" end |